package com.company.woye.utils.barutil;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Build;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;

import androidx.drawerlayout.widget.DrawerLayout;


public class StatusBarUtil {

    public static final int DEFAULT_STATUS_BAR_ALPHA = 112;


    /**
     * 设置状态栏颜色
     *
     * @param activity
     *            需要设置的 activity
     * @param color
     *            状态栏颜色值
     */
    public static void setColor(Activity activity, int color) {
        setColor(activity, color, DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 设置状态栏颜色
     *
     * @param activity
     *            需要设置的activity
     * @param color
     *            状态栏颜色值
     * @param statusBarAlpha
     *            状态栏透明度
     */


    public static void setColor(Activity activity, int color, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow()
                    .addFlags(
                            WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            activity.getWindow().clearFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            activity.getWindow().setStatusBarColor(
                    calculateStatusColor(color, statusBarAlpha));
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            ViewGroup decorView = (ViewGroup) activity.getWindow()
                    .getDecorView();
            int count = decorView.getChildCount();
            if (count > 0
                    && decorView.getChildAt(count - 1) instanceof StatusBarView) {
                decorView.getChildAt(count - 1).setBackgroundColor(
                        calculateStatusColor(color, statusBarAlpha));
            } else {
                StatusBarView statusView = createStatusBarView(activity, color,
                        statusBarAlpha);
                decorView.addView(statusView);
            }
            setRootView(activity);
        }
    }


    /**
     * 为滑动返回界面设置状态栏颜色
     *
     * @param activity
     *            需要设置的activity
     * @param color
     *            状态栏颜色值
     */
    public static void setColorForSwipeBack(Activity activity, int color) {
        setColorForSwipeBack(activity, color, DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 为滑动返回界面设置状态栏颜色
     *
     * @param activity
     *            需要设置的activity
     * @param color
     *            状态栏颜色值
     * @param statusBarAlpha
     *            状态栏透明度
     */
    public static void setColorForSwipeBack(Activity activity, int color,
                                            int statusBarAlpha) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            ViewGroup contentView = ((ViewGroup) activity
                    .findViewById(android.R.id.content));
            contentView.setPadding(0, getStatusBarHeight(activity), 0, 0);
            contentView.setBackgroundColor(calculateStatusColor(color,
                    statusBarAlpha));
            setTransparentForWindow(activity);
        }
    }


    /**
     * 设置状态栏纯色 不加半透明效果
     *
     * @param activity
     *            需要设置的 activity
     * @param color
     *            状态栏颜色值
     */
    public static void setColorNoTranslucent(Activity activity, int color) {
        setColor(activity, color, 0);
    }


    /**
     * 设置状态栏颜色(5.0以下无半透明效果,不建议使用)
     *
     * @param activity
     *            需要设置的 activity
     * @param color
     *            状态栏颜色值
     */
    @Deprecated
    public static void setColorDiff(Activity activity, int color) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        ViewGroup contentView = (ViewGroup) activity
                .findViewById(android.R.id.content);
// 移除半透明矩形,以免叠加
        if (contentView.getChildCount() > 1) {
            contentView.getChildAt(1).setBackgroundColor(color);
        } else {
            contentView.addView(createStatusBarView(activity, color));
        }
        setRootView(activity);
    }


    /**
     * 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity
     *            需要设置的activity
     */
    public static void setTranslucent(Activity activity) {
        setTranslucent(activity, DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity
     *            需要设置的activity
     * @param statusBarAlpha
     *            状态栏透明度
     */
    public static void setTranslucent(Activity activity, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparent(activity);
        addTranslucentView(activity, statusBarAlpha);
    }


    /**
     * 针对根布局是 CoordinatorLayout, 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity
     *            需要设置的activity
     * @param statusBarAlpha
     *            状态栏透明度
     */
    public static void setTranslucentForCoordinatorLayout(Activity activity,
                                                          int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        addTranslucentView(activity, statusBarAlpha);
    }


    /**
     * 设置状态栏全透明
     *
     * @param activity
     *            需要设置的activity
     */
    public static void setTransparent(Activity activity) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        setRootView(activity);
    }


    /**
     * 使状态栏透明(5.0以上半透明效果,不建议使用)
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity
     *            需要设置的activity
     */
    @Deprecated
    public static void setTranslucentDiff(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
          // 设置状态栏透明
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            setRootView(activity);
        }
    }


    /**
     * 为DrawerLayout 布局设置状态栏变色
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     * @param color
     *            状态栏颜色值
     */
    public static void setColorForDrawerLayout(Activity activity,
                                               DrawerLayout drawerLayout, int color) {
        setColorForDrawerLayout(activity, drawerLayout, color,
                DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 为DrawerLayout 布局设置状态栏颜色,纯色
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     * @param color
     *            状态栏颜色值
     */
    public static void setColorNoTranslucentForDrawerLayout(Activity activity,
                                                            DrawerLayout drawerLayout, int color) {
        setColorForDrawerLayout(activity, drawerLayout, color, 0);
    }


    /**
     * 为DrawerLayout 布局设置状态栏变色
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     * @param color
     *            状态栏颜色值
     * @param statusBarAlpha
     *            状态栏透明度
     */
    public static void setColorForDrawerLayout(Activity activity,
                                               DrawerLayout drawerLayout, int color, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow()
                    .addFlags(
                            WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            activity.getWindow().clearFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
// 生成一个状态栏大小的矩形
// 添加 statusBarView 到布局中
        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
        if (contentLayout.getChildCount() > 0
                && contentLayout.getChildAt(0) instanceof StatusBarView) {
            contentLayout.getChildAt(0).setBackgroundColor(
                    calculateStatusColor(color, statusBarAlpha));
        } else {
            StatusBarView statusBarView = createStatusBarView(activity, color);
            contentLayout.addView(statusBarView, 0);
        }
// 内容布局不是 LinearLayout 时,设置padding top
        if (!(contentLayout instanceof LinearLayout)
                && contentLayout.getChildAt(1) != null) {
            contentLayout.getChildAt(1).setPadding(
                    contentLayout.getPaddingLeft(),
                    getStatusBarHeight(activity)
                            + contentLayout.getPaddingTop(),
                    contentLayout.getPaddingRight(),
                    contentLayout.getPaddingBottom());
        }
// 设置属性
        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
        drawerLayout.setFitsSystemWindows(false);
        contentLayout.setFitsSystemWindows(false);
        contentLayout.setClipToPadding(true);
        drawer.setFitsSystemWindows(false);


        addTranslucentView(activity, statusBarAlpha);
    }


    /**
     * 为DrawerLayout 布局设置状态栏变色(5.0以下无半透明效果,不建议使用)
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     * @param color
     *            状态栏颜色值
     */
    @Deprecated
    public static void setColorForDrawerLayoutDiff(Activity activity,
                                                   DrawerLayout drawerLayout, int color) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
// 生成一个状态栏大小的矩形
            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
            if (contentLayout.getChildCount() > 0
                    && contentLayout.getChildAt(0) instanceof StatusBarView) {
                contentLayout.getChildAt(0).setBackgroundColor(
                        calculateStatusColor(color, DEFAULT_STATUS_BAR_ALPHA));
            } else {
// 添加 statusBarView 到布局中
                StatusBarView statusBarView = createStatusBarView(activity,
                        color);
                contentLayout.addView(statusBarView, 0);
            }
// 内容布局不是 LinearLayout 时,设置padding top
            if (!(contentLayout instanceof LinearLayout)
                    && contentLayout.getChildAt(1) != null) {
                contentLayout.getChildAt(1).setPadding(0,
                        getStatusBarHeight(activity), 0, 0);
            }
// 设置属性
            ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
            drawerLayout.setFitsSystemWindows(false);
            contentLayout.setFitsSystemWindows(false);
            contentLayout.setClipToPadding(true);
            drawer.setFitsSystemWindows(false);
        }
    }


    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     */
    public static void setTranslucentForDrawerLayout(Activity activity,
                                                     DrawerLayout drawerLayout) {
        setTranslucentForDrawerLayout(activity, drawerLayout,
                DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     */
    public static void setTranslucentForDrawerLayout(Activity activity,
                                                     DrawerLayout drawerLayout, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparentForDrawerLayout(activity, drawerLayout);
        addTranslucentView(activity, statusBarAlpha);
    }


    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     */
    public static void setTransparentForDrawerLayout(Activity activity,
                                                     DrawerLayout drawerLayout) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow()
                    .addFlags(
                            WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            activity.getWindow().clearFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }


        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
// 内容布局不是 LinearLayout 时,设置padding top
        if (!(contentLayout instanceof LinearLayout)
                && contentLayout.getChildAt(1) != null) {
            contentLayout.getChildAt(1).setPadding(0,
                    getStatusBarHeight(activity), 0, 0);
        }


// 设置属性
        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
        drawerLayout.setFitsSystemWindows(false);
        contentLayout.setFitsSystemWindows(false);
        contentLayout.setClipToPadding(true);
        drawer.setFitsSystemWindows(false);
    }


    /**
     * 为 DrawerLayout 布局设置状态栏透明(5.0以上半透明效果,不建议使用)
     *
     * @param activity
     *            需要设置的activity
     * @param drawerLayout
     *            DrawerLayout
     */
    @Deprecated
    public static void setTranslucentForDrawerLayoutDiff(Activity activity,
                                                         DrawerLayout drawerLayout) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// 设置状态栏透明
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
// 设置内容布局属性
            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
            contentLayout.setFitsSystemWindows(true);
            contentLayout.setClipToPadding(true);
// 设置抽屉布局属性
            ViewGroup vg = (ViewGroup) drawerLayout.getChildAt(1);
            vg.setFitsSystemWindows(false);
// 设置 DrawerLayout 属性
            drawerLayout.setFitsSystemWindows(false);
        }
    }


    /**
     * 为头部是 ImageView 的界面设置状态栏全透明
     *
     * @param activity
     *            需要设置的activity
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTransparentForImageView(Activity activity,
                                                  View needOffsetView) {
        setTranslucentForImageView(activity, 0, needOffsetView);
    }


    /**
     * 为头部是 ImageView 的界面设置状态栏透明(使用默认透明度)
     *
     * @param activity
     *            需要设置的activity
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTranslucentForImageView(Activity activity,
                                                  View needOffsetView) {
        setTranslucentForImageView(activity, DEFAULT_STATUS_BAR_ALPHA,
                needOffsetView);
    }


    /**
     * 为头部是 ImageView 的界面设置状态栏透明
     *
     * @param activity
     *            需要设置的activity
     * @param statusBarAlpha
     *            状态栏透明度
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTranslucentForImageView(Activity activity,
                                                  int statusBarAlpha, View needOffsetView) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparentForWindow(activity);
        addTranslucentView(activity, statusBarAlpha);
        if (needOffsetView != null) {
            ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) needOffsetView
                    .getLayoutParams();
            layoutParams.setMargins(0, getStatusBarHeight(activity), 0, 0);
        }
    }


    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity
     *            fragment 对应的 activity
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTranslucentForImageViewInFragment(Activity activity,
                                                            View needOffsetView) {
        setTranslucentForImageViewInFragment(activity,
                DEFAULT_STATUS_BAR_ALPHA, needOffsetView);
    }


    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity
     *            fragment 对应的 activity
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTransparentForImageViewInFragment(Activity activity,
                                                            View needOffsetView) {
        setTranslucentForImageViewInFragment(activity, 0, needOffsetView);
    }


    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity
     *            fragment 对应的 activity
     * @param statusBarAlpha
     *            状态栏透明度
     * @param needOffsetView
     *            需要向下偏移的 View
     */
    public static void setTranslucentForImageViewInFragment(Activity activity,
                                                            int statusBarAlpha, View needOffsetView) {
        setTranslucentForImageView(activity, statusBarAlpha, needOffsetView);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
                && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            clearPreviousSetting(activity);
        }
    }


// /////////////////////////////////////////////////////////////////////////////////


    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void clearPreviousSetting(Activity activity) {
        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
        int count = decorView.getChildCount();
        if (count > 0
                && decorView.getChildAt(count - 1) instanceof StatusBarView) {
            decorView.removeViewAt(count - 1);
            ViewGroup rootView = (ViewGroup) ((ViewGroup) activity
                    .findViewById(android.R.id.content)).getChildAt(0);
            rootView.setPadding(0, 0, 0, 0);
        }
    }


    /**
     * 添加半透明矩形条
     *
     * @param activity
     *            需要设置的 activity
     * @param statusBarAlpha
     *            透明值
     */
    private static void addTranslucentView(Activity activity, int statusBarAlpha) {
        ViewGroup contentView = (ViewGroup) activity
                .findViewById(android.R.id.content);
        if (contentView.getChildCount() > 1) {
            contentView.getChildAt(1).setBackgroundColor(
                    Color.argb(statusBarAlpha, 0, 0, 0));
        } else {
            contentView.addView(createTranslucentStatusBarView(activity,
                    statusBarAlpha));
        }
    }


    /**
     * 生成一个和状态栏大小相同的彩色矩形条
     *
     * @param activity
     *            需要设置的 activity
     * @param color
     *            状态栏颜色值
     * @return 状态栏矩形条
     */
    private static StatusBarView createStatusBarView(Activity activity,
                                                     int color) {
// 绘制一个和状态栏一样高的矩形
        StatusBarView statusBarView = new StatusBarView(activity);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(color);
        return statusBarView;
    }


    /**
     * 生成一个和状态栏大小相同的半透明矩形条
     *
     * @param activity
     *            需要设置的activity
     * @param color
     *            状态栏颜色值
     * @param alpha
     *            透明值
     * @return 状态栏矩形条
     */
    private static StatusBarView createStatusBarView(Activity activity,
                                                     int color, int alpha) {
// 绘制一个和状态栏一样高的矩形
        StatusBarView statusBarView = new StatusBarView(activity);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(calculateStatusColor(color, alpha));
        return statusBarView;
    }


    /**
     * 设置根布局参数
     */
    private static void setRootView(Activity activity) {
        ViewGroup rootView = (ViewGroup) ((ViewGroup) activity
                .findViewById(android.R.id.content)).getChildAt(0);
        if (rootView!=null) {
            rootView.setFitsSystemWindows(true);
            rootView.setClipToPadding(true);
        }
    }


    /**
     * 设置透明
     */
    private static void setTransparentForWindow(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
            activity.getWindow()
                    .getDecorView()
                    .setSystemUiVisibility(
                            View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow().setFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }


    /**
     * 使状态栏透明
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void transparentStatusBar(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow()
                    .addFlags(
                            WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            activity.getWindow().clearFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }


    /**
     * 创建半透明矩形 View
     *
     * @param alpha
     *            透明值
     * @return 半透明 View
     */
    private static StatusBarView createTranslucentStatusBarView(
            Activity activity, int alpha) {
// 绘制一个和状态栏一样高的矩形
        StatusBarView statusBarView = new StatusBarView(activity);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(Color.argb(alpha, 0, 0, 0));
        return statusBarView;
    }


    /**
     * 获取状态栏高度
     *
     * @param context
     *            context
     * @return 状态栏高度
     */
    private static int getStatusBarHeight(Context context) {
// 获得状态栏高度
        int resourceId = context.getResources().getIdentifier(
                "status_bar_height", "dimen", "android");
        return context.getResources().getDimensionPixelSize(resourceId);
    }


    /**
     * 计算状态栏颜色
     *
     * @param color
     *            color值
     * @param alpha
     *            alpha值
     * @return 最终的状态栏颜色
     */
    private static int calculateStatusColor(int color, int alpha) {
        float a = 1 - alpha / 255f;
        int red = color >> 16 & 0xff;
        int green = color >> 8 & 0xff;
        int blue = color & 0xff;
        red = (int) (red * a + 0.5);
        green = (int) (green * a + 0.5);
        blue = (int) (blue * a + 0.5);
        return 0xff << 24 | red << 16 | green << 8 | blue;
    }
}
